the useful power out of an electric motor is 20w and the total power into the motor is 80w calculate the percentage efficiency of the motor

In Step 5, you will calculate H+/OH - ratios for more extreme pH solutions. Find the concentration of H + ions to OH - ions listed in Table B of your Student Guide for a solution at a pH = 2.

Scientists do not always have to use all seven of the steps in the scientific method. true or false

Find the product. If the result is negative, enter "-". If the result is positive, leave the box empty. 7 (-a^2) ^2 (-b^3)

A jet fighter flying at 300 m/s (just below the speed of sound) makes a turn of radius 2.25 km. (a) what is its centripetal acceleration in gs?

What do you mean by gravity

34) Fewer than disability and, of that number, only. a) 5%; 3-4% b) 3%; 1-2% c) 2%; 3-4% d) 2%; 3-5% the general population are classified as having an intellectual are profoundly intellectually disabled.

The force on a current-carrying wire is a maximum when the current is moving parallel to a magnetic field. true or false

Suppose you want to operate an ideal refrigerator with a cold temperature of - 10.0ºC, and you would like it to have a coefficient of performance of 7. 00. What is the hot reservoir temperature for such a refrigerator? (answer in ºC)

A missile is fired from a jet flying horizontally at Mach 1 (1100 ft/s). The missile has a horizontal acceleration of 1000 ft/s2. Calculate its horizontal velocity at 10.0 seconds after it is fired.

What is the geocentric model of the Solar System? A. The thought that the Sun is the center of the Solar System. B. The belief that the Moon is the center of the Solar System. C. The idea that the Earth is the center of the universe. D.